A usually black colored night tailcoat donned by guys as part of the white link gown signal.
A coat donned by guys on occasions of ceremony; specially, a coat suitable firmly, and achieving the dresses cut away within the sides. See coat, and full dress, under dress.
A coat with skirts behind only, as distinct through the frock-coat, which the dresses surround the human body. It's worn on occasions of ceremony. The dress coat of officers of US army is a full-skirted frock-coat.